Smartwool Classic Merino Base Layer Bottom Boxed Women's Thermal Leggings Black Size M

Engineered from 100% ZQ-certified Merino wool with a substantial 250 g/m² interlock knit, these Smartwool Classic Merino Base Layer Bottoms deliver exceptional warmth-to-weight performance for cold-weather pursuits. The midweight fabric traps heat while actively wicking moisture, keeping you dry and comfortable from first chair to last run.

Overview

Cut in a women's-specific slim fit, these base layer leggings feature a covered elastic waistband that stays put without digging in, flatlock seams to prevent chafing, and a crotch gusset for unrestricted movement. The naturally odor-resistant Merino wool means you can wear them multiple times between washes—ideal for multi-day ski trips or backcountry adventures.

What stands out

• 100% Merino wool (250 g/m²) offers superior insulation, breathability, and moisture management
• ZQ-certified wool guarantees ethical sourcing and sustainable farming practices
• Flatlock seam construction eliminates irritation during high-output activities
• Crotch gusset enhances mobility for skiing, hiking, or climbing
• Naturally odor-resistant—stays fresh even after extended wear

Technical details

• Material: 100% Merino wool, interlock knit
• Fabric weight: 250 g/m² (midweight)
• Fit: Slim, women's specific
• Waistband: Covered elastic
• Seams: Flatlock to reduce chafing
• Gusset: Crotch gusset for comfort and mobility
• Inseam (size M): Approx. 29.5 in (75 cm)
• Care: Machine wash cold gentle, tumble dry low; do not bleach, iron low, do not dry clean

Our verdict

A versatile, high-performance base layer that excels in cold, dry conditions. The premium Merino wool offers natural temperature regulation and odor resistance, making it a reliable foundation for any winter wardrobe.